Stay-bolt chuck.



R. F. WHALEN & H. D. PALMER.

STAY BOLT CHUCK.

APPLICATION FILED AUG. 23, 1913.

Patented Feb. 9, 1915.

4 1 7 vv vx FigtI Witnesses "HE NORRISFPETERS C0,. PHOTO-LITHO.,WASHINGTON. D. C,

' RICHARD FRANCIS WHALEN AND HARVEY n. returns, or 'roPEKa, KANSAS.

STAY-BOLT CHUCK.

Specification of Letters Patent.

Patented Feb. 9, 1915.

To all 20710112. it may concern:

Be it known-that we, RIcrIAnD FRANCIS VVHALEN and HARVEY D. PALMER,citizens of the United States, residing at Topeka, in the county ofShawnee and Stateof Kansas, have invented certain new and useful1mprovements in Stay-Bolt Chucks, of which the following is aspecification.

Our invention is a device to facilitate the running in or screwing in ofstay-bolts and other work of similar general nature. OW- ing to thegreat number of stay-bolts used in locomotive work, it is a matter ofeconomy to provide means for rapidly screwing in each stay-bolt and aswell to grip and release each stay-bolt so that the means employed maybe quickly moved from staybolt to staybolt and thus be kept as nearlyconstantly as possible to its real work, the screwing; in of thestay-bolts.

It is the object of our invention to provide for quickly gripping thestay-bolt and for quickly releasing it, also to grip it securely so thatthe motor employed inay screw it in rapidly and firmly, to provide aselfcentering chuck that may be quickly applied to and released from thestay-bolt; to provide such a chuck that can be used upon various sizes(as to diameters) of staybolts; to provide a convenient casing for suchchuck; to provide a casing suitable for holding chucks'o'f varioussizes, each chuck being self-centering, and each chuck being itselfadapted toa wide range of work; and to provide the parts, improvements,and combinations hereinafter set forth.

Our invention comprises as its main feature a chuck having ascrew-threaded tapered opening for gripping the work; it also comprisesa special casing for bold ing the chuck; and it also comprises thecombination of the chuck and the easing, and as well the parts,improvements, and combinations hereinafter set forth and claimed.

In the drawings accompanying and forming part of thisispecilication andin the description of the drawings we have shown our invention in itspreferred form and what 7 we deem to be the best mode of applying theprinciples thereof; but it is to be understood that within the scope ofthe appended claims we contemplate changes in form, proportions, andmaterials, the transposition of parts, and the substitution ofequivalent members,- without departing from the spirit ot our invention.I

Figure I 181 21 central longitudinal sec- ;tional elevation of a chuckand casing made in accordance with our invention. '15 a View oi theouter end of the chuck Fig. ii

threaded tapered opening 2, which opening,

as a matter of convenience in manufacture, may extend on through thebody of the chuck as indicated at 3. The end of the chuck having thesmaller end of the tapered opening is formed with a transverse slot &for a purpose presently described.

5 is the casing having a stem or shank 6 whereby it may be applied tothe sleeve or hollow spindle of any suitable motor. The casing is formedwith a socket 7 for receiv ing the .chuckand with a transverse bar orkey 8 which engages in the slot 4 for the purpose of preventing rotarymovement of the chuck with relation to the casing. A cap 9 fits over theend of the casing, and has screw-threaded engagement with the casing,

as indicated at 10. The chuck is preferably slightly longer than thesocket so that it projects slightly from the end of thecasing, so thatthe cap is free to clamp the chuck firmly between the socket and the capwhen the cap is screwed down firmly. The cap is formed with a centralopening 11 registering with. the screw-threaded tapered opening of thechuck for the purpose of admitting the work thereto, and this openingshould correspond with, or be larger than, the outer and larger end ofthe tapered opening. Obviously the screw-threading in the taperedopening should be in conformity with the direction of the rotation ofthe chuck. Preferably this threading is rather coarse, and the chuckproper is made of tool steel, while the casing may be made of anysuitable quality or kind of material. The transverse bar or key 8 issecured permanently in position by driving it through holes in the sidewalls of the case, so that it becomes integral with the casing, and isnot loose or detachable.

The usual method of operating our de- Vice is, by means of a suitabledriving mechanism, preferably a portable motor. The stay-bolt beingplaced in position by screwing it in a few threads to hold it in properplace, is gripped by the chuck by moving the chuck and motor to theouter end of the stay-bolt and applying the chuck thereto. The chuck ispressed onto the end of the stay-bolt, the threading of the chuck cuts acorresponding threading upon the end of the stay-bolt for a distance oftwo or three threads, more or less, depending of course upon theresistanceencountered by the staybolt,t hus affording the chuck athreaded engaging grip upon the end of the stay-bolt, the continuedrotation of the chuck screws in the stay-bolt, and when vproperlyscrewed in, the chuck is reversed by reversing the motor and instantlyreleases its grip upon the staybolt. A given chuck may be applied to anywork fitting Within the maximum and minimum diameters of the taperedopening.

It will be noted that the chuck is automatically centered when appliedto the work, and that as the resistance increases the grip becomesbroader and stronger. It will also be now understood that the chuck whenused with a suitable portable motor greatly facilitates the class ofwork to which it is applicable. Thus, in running in stay-bolts, if alarge number of the stay-bolts be set in place by screwing each one injust enough to hold it, our device may be quickly applied to eachstay-bolt to grip it, screw it in, and release it; the continuousoperation being to start the motor, apply the chuck to a staybolt,reverse the motor twice and apply the chuck to the next stay-bolt, etc.If any staybolt should not release upon reversing the motor, it is tooloose and should be removed; but the chuck will not fail to releaseunless the bolt is very loose. When a chuck is worn out it may be easilyand quickly replaced. So, too, it is an easy matter to change chucks fordifferent classes of work.

' \Ve lay special emphasis upon the application of our invention tostay-bolt work because of its special adaptability to that class Copiesof this patent may be obtained, for

of work as herein illustrated; but of course we do not limit its use orapplication to staybolt work.

\Vhat we claim is 1. The combination of a staybolt chuck having anaxially extending screw-threzuled tapered opening for gripping having atransverse slot in one end, a casing formed for attachment to a motorand having a socket for the reception of said chuck and a transverse barin the bottom of the socket for engaging in the slot, said bar be ingpermanently secured to the casing, and a cap fitting on the end of thecasing and having screw-threaded engagement with the casing and clampingthe chuck in the socket with the bar engaged in the slot and also havinga central opening concentric with the chucks tapered opening foradmitting the work thereto.

2. Ihe process of fastening stay-bolts in place which consists inscrewing a metal bolt into its mating part by gripping the bolt-headwith a turning pressure applied along a conical spiral line,simultaneously with the application of the turning pressure cutting intosaid head along saidline to increase the turning pressure to overcomethe resistance offered to the turning of'the bolt and then releasingsaid turning pressure by reversing the direction of its application.

3; The process of applying and removing stay-bolts which consists inturning a screwthreaded bolt in its mating part by gripping thebolt-head with'a turning pressure applied along a conical spiral line,simultaneously with the application of the turning pressure cutting intosaid head along said line to increase the turning pressure to overcomethe resistance offered to the turning of the bolt, and then releasingsaid turning pressure by a relative reversal of the direction of itsapplication.

In testimony whereof we have 'aflixed our signatures in presence of twowitnesses.

RICHARD FRANCIS WHALEN. HARVEY D. PALMER.

Witnesses:

C. J. Rosnn, J. M. STARK.

five cents each, by addressing the Commissioner of Patents,

Washington, D. C.

the work and a

